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What's e^-x?

Quote: Originally Posted by redraider717 What's e^-x? y' = -e^-x

Quote: Originally Posted by redraider717 What's e^-x? $\displaystyle y=e^u$ $\displaystyle y'=e^u u'$ $\displaystyle y=e^{-x}$ $\displaystyle y'=-e^{-x}$